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NSW prison officer 'tried to kill husband'

A high-ranking NSW Corrective Services officer spiked her husband's beer before leaving him asleep in his car with an open gas cylinder in an attempt to kill him in a fire or explosion, a jury has been told.

Weeks earlier, Sharon Yarnton, now 50, allegedly told a bank manager she wouldn't care if her husband burned to death.

Crown prosecutor Guy Newton said during his opening address in the NSW District Court on Wednesday that Dean Yarnton woke alone to the hissing of an open LPG gas cylinder in the early hours of February 1, 2015.

The jury is expected to hear the car was parked next to bushland at Picnic Point and his then-wife, who had been driving him home from dinner at the Merrylands Bowling Club, had disappeared, Mr Newton said.

Mr Yarnton turned off the cylinder in the back seat and left the car, only to find his socks were wet with petrol.

There was another gas bottle, a lighter and a glove nearby.

When Mr Yarnton called his wife, she said she'd taken a toilet break in the bushes and was lost, the prosecutor said.

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But police didn't believe her story and she and her alleged accomplices, Monique Hayes, 25, and Fady Houda, 24, have pleaded not guilty to attempted murder and to throwing or laying down an explosive with intent to maim or do grievous bodily harm.

Yarnton had allegedly known Hayes for years and the Crown's case is that the younger woman and her husband Houda helped Yarnton with the murder plot.

Messages sent by Yarnton to Hayes on the night of the attempted murder said "Hey, where are they" and "Tell him now", while a response from Hayes said "Go now, delete everything", the Crown will allege.

Houda's defence barrister Michael Pickin told the jury his client didn't go to Picnic Point that night and he was not involved in any attempt to ignite Mr Yarnton's vehicle.

The jury is expected to hear there was significant tension in the 23-year Yarnton marriage and their dinner that night was supposed to be their last before they separated.

The prosecutor said Mr Yarnton would give evidence that his wife bought him a beer during the dinner that "tasted unusual" with granules seen on the glass.

CCTV footage will show that when she went to get him a replacement, she simply tipped the same beer into a new glass, Mr Newton said.

"Mr Yarnton says that he then drank some of that beer and afterwards started to feel extremely tired," he said.

The jury is also expected to hear allegations that Sharon Yarnton went to a bank before the attempted murder and told a manager that "loan sharks" were after her husband in an effort to create an explanation for the killing.